NCP workers blocked vehicular traffic at Trimbak Road and Kalwan in Nashik district to condemn the attack on their party chief. In adjoining Navi Mumbai, the agro produce market was closed in protest.

In Baramati, Pawar's native place in Pune district, traders observed spontaneous bandh. Political parties were quick to denounce the assault.

Maharashtra BJP President Sudhir Mungantiwar condmed the attack, describing it as cowardly.

Leader of Opposition in Maharashtra Assembly Eknath Khadse said, "In a democracy, such attacks are condemnable. One can protest using non-violent means but such an attack cannot be justified."

Home Minister and NCP leader RR Patil said Pawar's security needs to be stepped up in the aftermath of the incident.

The 71-year-old Pawar, who went to attend a literary function at a public auditorium on Parliament Street, was slapped by Harvinder Singh, a transporter in his 30s who had also assaulted former telecom minister Sukhram outside Rohini Court on Saturday after he was sentenced in a corruption case.

The NCP workers also held protests at Mulund and Worli areas of Mumbai.

Some party workers were taken into custody in suburban Mulund for trying to disturb law and order, said a police official.

Tight security is being maintained across Mumbai following the incident, said police.